import java.util.Scanner;

public class lost {
	public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	int a=10;
	int b=20;
    int c;
    c=a;
    a=b;
    b=c;

	System.out.println("a="+a);
	System.out.println("b="+b);
    }
	
	
}
